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Fill-In-the-Middle (FIM)

Gemini Coder's FIM feature enables you inserting AI generated code completions directly at cursor's position while using the selected context. This feature uses frontier models, much bigger than those in other tools' "tab completion" features and is designed for on-demand use. We observe that the trade-off between speed and accuracy of this approach is worth the increase in latency.

Structure of the generated message:

<files>
  [CONTEXT FILES]
  <file name="...">
    ...
    <fill missing code>
    ...
  </file>
</files>
Somewhere in files you encountered the <fill missing code> symbol. Send the missing code only, without explanations, or any other text.

How it works​

Select context​

Open the extension's panel and choose relevant folders and files.

Position cursor​

Place your cursor where you want to generate completion.

Run FIM​

Execute Gemini Coder: FIM Completion from the Command Palette to use the default model or use Gemini Coder: FIM Completion with... to select any other model. You can also enter "FIM mode" in the chat which is convenient for follow-ups.

Completion​

AI generated completion is inserted.

info

Bind Gemini Coder: FIM Completion to a keyboard shortcut for fastest access.

Available commands​

Gemini Coder: FIM Completion​

Inserts the AI-generated completion directly at the cursor's position using the default FIM model.

Gemini Coder: FIM Completion with...​

Lets you select which model to use for FIM completion.

Gemini Coder: FIM Completion with Suggestions​

Prompts for optional suggestions (e.g., "Avoid writing comments") before generating the FIM completion using the default model.

Gemini Coder: FIM Completion with Suggestions with...​

Prompts for optional suggestions and lets you select which model to use for FIM completion.

Gemini Coder: FIM Completion to Clipboard​

Instead of inserting completion directly, copies the FIM completion prompt content (including context) to your clipboard for use in other tools.

Gemini Coder: FIM Completion with Suggestions to Clipboard​

Prompts for optional suggestions, then copies the FIM completion prompt content (including context and suggestions) to your clipboard.

Gemini Coder: FIM in Chat​

Prompts for optional suggestions, then sends the FIM completion prompt content (including context and suggestions) to the previously selected web chat preset(s) via the browser connector.

Gemini Coder: FIM in Chat with...​

Prompts for optional suggestions, lets you select a specific web chat preset, and then sends the FIM completion prompt content (including context and suggestions) to that preset via the browser connector.

Gemini Coder: Change Default FIM Model​

Configure which model should be used as the default for FIM completions.